Improvement in stone-breakers



S'. Lf. MARSDBN Stone-Breaker.

Patented Jan.,1878.

No.198,s4'9.

UlvrrEnl j PATENTQOEEICE SAMUEL L. MnEsDEiv, oF NEW HAVEN, CONNECTICUT,` AssIGNoR fro;

- i" BLAKE CnUsEEE CoMPANn-ipoEEsAMEPLACE.

IM PEovEMl-:NT IN YsToN E- BREAK ERS.

Specification forming part of Letters Patent No. 198,849, dated January 1, 1878 application filed Y July 27, 1877. i

To all 'whom it may concern: f [Be it known that I, SAMUEL L. MARsDEN, of New Haven, in the county of New Haven and State of Connecticut, have' invented a new Improvement in Stone-Crushers; and I do hereby declare the following, when taken in connectionwith theaccompanying drawings and the letters of reference marked thereon, to be a full, clear, and eXactldescripf plate to the jaws is an expensive part of theA Various devices have been resorted machine. to to facilitate this tting, such as casting the jaws onto wrought-iron bars, to be subsequently planed, (it will be understood that the jaws require to be chilled, hence the metal of the jaw is too hard throughout to work the rear surface advantageously;) but in practice itis difficult to prevent the springing of the j aw-plate when the surface ofthe wrought metal is cut away, as in iitting the plate to the jaw. The obj ect of this invention is to avoid these difiieulties; and it consists principally in casting the jaw-plate with several recesses on the rear surface, and then filling those recesses with Babbitt or similar metal, and also in the method for seeming the j aw-plate as hereinafter described.

A represents one of the movable jaws of a w Blake Crusher. Across its face is arecess, dovetail or hook shaped at the bottom, as shown; B, the jaw-plate, the working surface of which is formed in ribs, or any of the known forms. The rear surface of the jaw-plate is cast with recesses a, more or less in number, and of any desirable shape, a quarter of an inch in depth, more or less. These recesses are subsequently filled with Babbitt or other similar metal, and

so as to project above the rear surface of the plate.

. The shape of the recesses should be irregul l jaw-plate is chilled, all liability to spring or change the shape of the plate is avoided, and the soft metal is more easily worked than the iron bars heretofore used. p

When jaw-plates are cast upon wroughtiron bars to accomplish the same purpose, a great strain is necessarily brought upon the plate, as it shrinks upon the iron bars. This also tends to an easy breaking of the jaw, as by concussion 'or otherwise, which is entirely avoided by the use of the filling metal described. I Y

It is desirable and practically essential that the jaws should be made reversiblethat is, so that, when the lower end has been worn away, the jaw-plate may be turned end for end, and present a newand practically unworn surface at the bottom, where the greatest wear comes. For this purpose the upper and lower ends are shaped alike, and to correspond to the dovetail or hook shaped portion C on the jaws, so that either end may lit that seat. i

At the center or other convenient point the jaw-plate is constructed with a lug, ct', and the seat 0, at the lower end of the jaw, is con structed with a corresponding cavity, d and there is also at the upper end a similar cavity, y

e', to receive the lug at that end of the jawplate. Theselugs and cavities locate the jawplate in its proper relative position, and prevent transverse misplacement. The lugs a. are divided, or formed with a recess, e', and at the upper end of the jaw a perforation is made corresponding to the recess e', and through which a bolt, f, is passed,the head of which overhangs the end of the jaw, as seen in Fig. 2, and so as to secure it in its place,

this simple bolt `being all the security that is4 necessary in addition to the lugs 'and cavities before mentioned.

In previous constructions the jaw-plate has the jaw a; x, the jew-plate, constructed with projecting lugs at both ends, and the jaw With a seat for seid'plate at the lower end,

and a cavity to receive either of said lugs, Y

Witha, bolt through the jaw, the head of which engagesthe upper lug, lsubstantially es described.

. SAML. L. MARSDEN.

Witnesses:

JOHN E. EARL, H. A. KrrsoN. 

